構造ー音場連成系のモーダル周波数応答感度解析手法の開発

概要

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The previous reports by the authors presented analytical methods for determining the sensitivities of the eigenvalues and eigenvectors and the sensitivity of the direct frequency response (DFR) of coupled acoustic-structural systems, with the aim of reducing vehicle interior noise levels. As a continuation of the previous studies, this paper deals with an investigation into the modal frequency response (MFR) of a coupled system and proposes a method for analyzing its MFR sensitivity. Two types of analytical method are derived for finding the MFR sensitivities; one is based on the eigenpair sensitivity of a coupled system and the other on the direct differentiation of the modal frequency response. It is shown that the latter method could also be derived from the DFR sensitivity and that it is the most effective method in terms of calculation accuracy and efficiency. A coupled acoustic-box model and a coupled acoustic-vehicle model are used in the analysis to confirm the applicability of the proposed methods to actual noise analysis problems.
社団法人日本機械学会の論文
1991-04-25